Check out how to easily wipe cache partition in MEDION LIFETAB P7331. This operation won't affect your personal files it will only remove temporary cache files. As a result you can refresh Android 5.0 Lollipop system and optimize Intel Atom Z3735G.
At the onset, press and hold the Power button and when the menu appears on the screen tap the Power Off to turn the device off.
Once the device is turned off, press and hold the Power button + Volume Up button. After the MEDION logo appears on the screen you can release bot buttons.
Now the Recovery Mode should appear on the screen. Use the Volume Up and Down buttons to move through the menu.
Afterward, move down to Wipe cache partition and press the Power button to continue.
Now select Yes and press the Power button to confirm.
Next, select the Reboot system now and press the Power button to confirm.